#!/usr/bin/env python

# Copyright 2012-2013, Andrey Kislyuk and argcomplete contributors.
# Licensed under the Apache License. See https://github.com/kislyuk/argcomplete for more info.

'''
This script is part of the Python argcomplete package (https://github.com/kislyuk/argcomplete).
It is used to check if an EASY-INSTALL-SCRIPT wrapper redirects to a script that contains the string
"PYTHON_ARGCOMPLETE_OK". If you have enabled global completion in argcomplete, the completion hook will run it every
time you press <TAB> in your shell.

Usage:
    python-argcomplete-check-easy-install-script <input executable file>
'''

import sys

if len(sys.argv) != 2:
    sys.exit(__doc__)

sys.tracebacklimit = 0

with open(sys.argv[1]) as fh:
    line1, head = fh.read(1024).split("\n", 1)[:2]
    if line1.startswith('#') and ('py' in line1 or 'Py' in line1):
        import re
        lines = head.split("\n", 12)
        for line in lines:
            if line.startswith("# EASY-INSTALL-SCRIPT"):
                import pkg_resources
                dist, script = re.match("# EASY-INSTALL-SCRIPT: '(.+)','(.+)'", line).groups()
                if "PYTHON_ARGCOMPLETE_OK" in pkg_resources.get_distribution(dist).get_metadata('scripts/'+script):
                    exit(0)
            elif line.startswith("# EASY-INSTALL-ENTRY-SCRIPT"):
                dist, group, name = re.match("# EASY-INSTALL-ENTRY-SCRIPT: '(.+)','(.+)','(.+)'", line).groups()
                import pkg_resources, pkgutil
                module_name = pkg_resources.get_distribution(dist).get_entry_info(group, name).module_name
                with open(pkgutil.get_loader(module_name).get_filename()) as mod_fh:
                    if "PYTHON_ARGCOMPLETE_OK" in mod_fh.read(1024):
                        exit(0)
            elif line.startswith("# EASY-INSTALL-DEV-SCRIPT"):
                for line2 in lines:
                    if line2.startswith('__file__'):
                        filename = re.match("__file__ = '(.+)'", line2).group(1)
                        with open(filename) as mod_fh:
                            if "PYTHON_ARGCOMPLETE_OK" in mod_fh.read(1024):
                                exit(0)
            elif line.startswith("# PBR Generated"):
                module = re.search("from (.*) import", head).groups()[0]
                import pkg_resources, pkgutil
                with open(pkgutil.get_loader(module).get_filename()) as mod_fh:
                    if "PYTHON_ARGCOMPLETE_OK" in mod_fh.read(1024):
                        exit(0)

exit(1)
